Costco Wholesale is the retailer, Kirkland Signature appears on many prepared foods, the warehouse deli handles advance platter orders, and Costco Same-Day uses Instacart for delivery. How Much Does Costco Catering Cost? Catering amounts by itemThe clearest current benchmark is the artisan sandwich platter. What we verifiedArticle HighlightsA 20-sandwich Costco platter was reported at about $50 in June 2026.in June 2026. Warehouse deli purchases are collected by the buyer unless a qualifying prepared product is available through Costco Same-Day.